Perhaps you should try some spelling variations:
nhanh chong » thanh cong, khanh phong
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
nganh cong » thanh cong
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
bai toan » bai tap
toan tai » toan tap, doanh tai, toan ban
hoi bai » hoc bai, hoi tai, khoi bay
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach hoc tap, nghien thu cong hoc ((nganh cong) OR (nhanh chong)) hoc ma hoi bai toan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach hoc tap, nghien thu cong hoc ((nganh cong) OR (nhanh chong)) hoc ma hoi bai toan tai".
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien thu cong hoc ((nganh cong) OR (nhanh chong)) hoc ma hoi bai toan tai*.